If $x$ is an integer, then which of the following statements about $x^2 - x - 1$ is true? - The Beat The GMAT Forum

If $x$ is an integer, then which of the following statements about $x^2 - x - 1$ is true?

A) It is always odd.
B) It is always even.
C) It is always positive.
D) It is even when $x$ is even and odd when $x$ is odd.
E) It is even when $x$ is odd and odd when $x$ is even.

Answer: A

Source: Princeton Review

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